<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>Insert title here</title>
		<script>
			for (var key in window) {// key --> property name (string)
				console.log(key + ", " + window[key]);
			}
		</script>
		<script>
		  var a = "hello";
		</script>
	</head>
	<body>

	</body>
</html>